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A comparator turns ON bellow reference voltage

Product Number: LT1011
Dear Analog Devices Corp.
 
 
Hello Analog Devices. This is Yong
I bought your product LT1011, and had done experiments.
 
 
 
I wonder why does a comparator turns ON that didn't meet the referenc voltage.
Would you please tell me how I can prevent these cases.
 
I enclosed the experimental results.
Experiment was conducted using a function generator and an oscilloscope.
 
Thank you.
Sincerely
YONG